Volgograd State Technical University (Volgograd, Russia)
V. F. Danenko, Cand. Eng., Associate Prof., Dept. of Materials Technology, omd@vstu.ru
M. D. Romanenko, Cand. Eng., Senior Lecturer, Dept. of Materials Technology, romanenko.mihail2009@yandex.ru
Computer modeling of the circular plastic compression of the lightning-protection cable (LK-O type strands) allowed us to establish the patterns of filling the inter-wire gaps in the layers of the 1 + 9 + 9 strand structure when the ratio of wire diameters in the layers δ1/δ2 is changed. It has been shown that the dense linear contact of the wires in the layers and between the layers after the strand is twisted in the 3.0 + 9 × 1.68 + 9 × 3.0 (δ1/δ2=0.56) design variant creates conditions for increasing the transfer of radial pressure into the strand and the degree of filling of the interwire gaps in the inner layer during circular compression. The formation of a radial gap during the twisting of the strand of the 3.0 + 9 × 1.6 + 9 × 3.0 (δ1/δ2=0.533) design variant contributes to the more intensive formation of additional lateral contacts between the wires of the outer layer at the initial stage of compression, which reduces the radial component of the pressure transmitted inside the strand and the degree of filling of the interwire gaps of the inner layer during the compression process. A linear correlation dependence of the variables y (the coefficient of filling gaps Kzap) and x (the degree of compression ql) in the layers of the strand has been established. The significance of the difference in the slope of the regression lines y = b • x + a, calculated from two samples for the inner layers of the strands during circular compression, has been confirmed by statistical processing of the modeling results. It is shown that when the compression ratio ql = 8.0 %, the relative radial deformation of the core of the 3.0 + 9 x 1.68 + 9 x 3.0 strand is 26.9 %, compared to 14.7 % for the 3.0 + 9 x 1.6 + 9 x 3.0 strand, with a maximum deformation of the modular tube of up to 20 % to ensure the operational reliability of the optical communication cable. The results of computer modeling of core deformation during circular compression are confirmed by experimental data obtained during the production of the 3.0 + 9 x 1.6 + 9 x 3.0 variant of the OKGT.
This work was supported by the Russian Science Foundation (project no. 25-29-20241) in collaboration with the Volgograd Region Administration (agreement no. 17 dated July 30, 2025).
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